<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <!--  这里是html的注释  -->
    <script>
        // js代码 -> js的注释 -> 对比python #
        /*
            多行注释
         */

        console.log("hello JavaScript");

    </script>
</head>
<body>
<h1>this is JavaScript</h1>
</body>
</html>